118. Convert Binary String to Integer Without strtol function or Libraries

#include <stdio.h>
#include <stdint.h>

uint16_t binary_to_uint(const char *str) {
    // Your logic here
    int i = 0;
    uint16_t ret = 0;

    while (str[i]) {
        ret <<= 1;
        ret |= ((str[i] - '0') * 0x1);
        i++;
    }

    return ret;
}

int main() {
    char bin[20];
    scanf("%s", bin);

    printf("%u", binary_to_uint(bin));
    return 0;
}

my logic is simpler than the solution